A semiconductor device includes three transistors, five switches, two inductors, and a capacitor. A first transistor has a gate. The switches have one terminal connected in series with a drain of the first transistor in parallel. A second transistor has a source connected to the first switch and a grounded gate. A third transistor having a source connected to the second switch and a grounded gate. A first inductor and a second inductor each has one terminal connected in series with the third switch in parallel. A fourth switch has one terminal connected to the first inductor and another terminal connected to the source of the second transistor. A fifth switch has one terminal connected to the second inductor and another terminal connected to the source of the third transistor. A capacitor connected between the one terminal of the fourth switch and the one terminal of the fifth switch.